Email Security

Everything on SPF, DKIM, DMARC, and defending against spoofed mail — plus a free downloadable guide.

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• Implementing DMARC for Enhanced Email Security: A Guide for Systems Administrators

  Posted on May 23, 2022

  Introduction [Read More]

  Tags:

  • Email
  • Microsoft 365
  • Exchange Online
  • DNS
  • SFP
  • DMARC
  • Email Security

• How to configure DKIM in Microsoft 365

  Posted on April 23, 2022

  DomainKeys Identified Mail (DKIM) is a solution for determining if the content of an email was modified after it was sent and to verify that the domain provided in the From address matches the domain name in cryptographic signature added by DKIM.1 [Read More]

  Tags:

  • Email
  • Microsoft 365
  • Exchange Online
  • DKIM
  • DNS
  • Email Security

• Configuring sender policy framework in Exchange Online

  Posted on April 23, 2022

  Before you change the configuration of your Exchange Online environment or public DNS, you should be comfortable with understanding what Sender Policy Framework (SPF) is and why it is important to properly configure. I wrote a introduction to SPF named, Blocking Spoofed Emails. [Read More]

  Tags:

  • Email
  • Microsoft 365
  • Exchange Online
  • DNS
  • SFP
  • Email Security

• Blocking spoofed emails

  Posted on December 11, 2021

  TLDR; Who is allowed to send email for your domain name? Did you know you can tell the whole world which servers are allowed to send email from your domain name (and therefore, email sent from servers which you have not authorized should be considered fraudulent and the receiving email... [Read More]

  Tags:

  • Email
  • RFC
  • DNS
  • SPF
  • Email Security